// less sass scss stylus postcss
html,
body {
    display: block;
    position: relative;
    height: 100%;
    font-size: 20px;
    margin: 0;
    padding: 0;
}

#root {
    display: block;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}